Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f99ebff5293395…

MALICIOUS

PDF

47.0 KB Created: 2020-07-17 18:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16af9c5488c3e4d1a297f6890bd6a4fc SHA-1: 260b4792b4aba532b57c2b51d35970b8a93900b4 SHA-256: 91f99ebff5293395f1d6a8958aee96891a819ce8380bd8fed0ec42a9720716bc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'American psycho online pdf', suggesting a lure for potentially pirated or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=american%20psycho%20online%20pdf
    • http://files.stitchedwithcare.com/uploads/1/3/1/3/131383624/dowumi-wefudazebukop-wivavin-tajewowe.pdf
    • http://files.dhendricksonphotography.com/uploads/1/3/0/7/130739368/nuwowulijudeti.pdf
    • http://files.wausauspokeeasy.com/uploads/1/3/0/7/130739007/4461801.pdf
    • http://files.seddonsonline.com/uploads/1/3/0/8/130874543/8531453.pdf
    • http://files.seddonsonline.com/upl
    • https://ruwefadadi.files.wordpress.com/2020/07/63491858893.pdf
    • https://litosem.files.wordpress.com/2020/06/16153709202.pdf
    • https://rajibixevako.files.wordpress.com/2020/06/80025128503.pdf
    • https://kinokazodisa.files.wordpress.com/2020/07/zureriwolezixi.pdf
    • https://fifalewev.files.wordpress.com/2020/07/vikis.pdf
    • https://fubizukolu.files.wordpress.com/2020/06/jadulororeforiwoj.pdf
    • https://boworuw.files.wordpress.com/2020/07/72592390424.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2613/files/xuzuzijefusufus.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5654/files/88575939298.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/88952017645.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/4778611063.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/xagifeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/xesulexejazagu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/75862933293.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52876055892.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b06.bin
e6af4f7b9a7a04a3d5ac2df4fcab35dc8f7ef3603e6cda90a83e7da3594b637b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B06 5196 bytes
font_01_sfnt_off00008c71.bin
dd193534e4b193d53317b8c8b34ebd16756b673cb12b549a694ea46820466491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C71 10036 bytes

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